Model Questions

Biochemistry Olympiad - 2010 University of Dhaka

S.S.C./O-level

(A Bengali version of the question paper will be provided in the final examination) Directions: Each of the questions or incomplete statements below is followed by four suggested answers or completions. Select the best answer in each case. Answer All questions: Question 1: Matter has ___________. (a) no mass but occupies space (b) mass but occupies no space (c) mass and occupies space (d) no mass and occupies no space Answer: (c) Question 2: In gases, particles vibrate _________. (a) about their mean position (b) about a vertical axis (c) about a horizontal axis (d) in any direction Answer: (a) Question 3: A property not possessed by a fluid is _________. (a) it can flow (b) it has mass (c) it has a definite shape (d) can be perceived by our senses Answer: (c) Question 4: A solid that sublimes on heating is _________. (a) sodium chloride (b) copper sulphate (c) lead sulphate (d) ammonium chloride Answer: (d) Question 5: Temperature is a measure of: (a) total kinetic energy of molecules (b) total potential energy of molecules (c) average potential energy of molecules (d) average kinetic energy of molecules Answer: (a)

Question 6: Carbon-12 atom has: (a) 6 electrons, 6 protons, 6 neutrons (b) 6 electrons, 12 protons, 6 neutrons (c) 12 electrons, 6 protons, 6 neutrons (d) 18 electrons, 6 protons and 6 neutrons Answer: (a) Question 7: An element has an electronic configuration: 2, 8, 7. Its valency is: (a) 1 (b) 7 (c) 17 (d) 8 Answer: (a) Question 8: Formation of lead and bromine from lead bromide is an example of: (a) decomposition reaction (b) synthesis reaction (c) displacement reaction (d) neutralisation reaction Answer: (a) Question 9: The main cause of rancidity in foods is: (a) Bacteria (b) Proteins (c) Antioxidants (d) Oxidation of fatty acid molecules Answer: (d) Question 10: In the equation

, the substance undergoing oxidation is ________. (a) lead dioxide (b) hydrochloric acid (c) hydrogen (d) lead chloride Answer: (b) Question 11: Which of the following statements is not applicable to carbon compounds? (a) They have low melting and boiling points. (b) They are ionic in nature. (c) They form homologous series. (d) They are generally soluble in organic solvents. Answer: (b)

Question 12: IUPAC name of

is: (a) propanol (b) butanol (c) 2-butanol (d) isobutanol Answer: (c) Question 13: Micelles are_________. (a) aggregates of amino acids (b) drops of oil or dirt that surrounds the molecule (c) a tadpole shaped fatty acid (d) cluster of soap molecules surrounding the dirt particle Answer: (d) Question 14: A diamond does not conduct electricity because: (a) its structure is very compact. (b) only carbon atoms are present in its structure. (c) there are no free electrons. (d) it is crystalline in nature. Answer: (c) Question 15: Which of the following statements is not true? (a) Alkali dissolve in water to form solutions with PH greater than 7 (b) Not all alkali are soluble in water (c) The products of neutralization are water and salt (d) When an alkali solution is neutral, there are equal numbers of hydroxide and

hydronium ions Answer: (b) Question 16: Which of the followings is not an organic compound?

(a) Vinegar (b) Quick lime (c) Petrol (d) Wood Answer: (b) Question 17: Artificial silk is produced from- (a) Ethanoic acid (b) Propanoic acid (c) Methanoic acid (d) Butyric acid Answer: (a)

Question 18: Vacuoles (in plant cells) _____. (a) produce energy for the cell (b) synthesize proteins (c) defend the cell (d) provide turgidity and rigidity to plant cells Answer: (d) Question 19: The organelle not present in animal cells is _____. (a) plastid (b) centrosome (c) nucleus (d) mitochondria Answer: (a) Question 20: Exchange of gases in higher plants takes place through _____________. (a) lenticels (b) roots (c) stomata (d) stem Answer: (c) Question 21: Photosynthesis is _______________. (a) a catabolic reaction (b) an anabolic reaction (c) an energy releasing reaction (d) none of the above Answer: (b) Question 22: Auxins are: (a) vitamins (b) enzymes (c) proteins (d) hormones Answer: (d) Question 23: Lack of magnesium in plants________________. (a) causes young leaves to wilt (b) causes leaves to turn dark green (c) increases starch production (d) reduces chlorophyll formation Answer: (d) Question 24: The part of the digestive system where no digestion takes place is _______. (a) mouth (b) oesophagus (c) ileum

(d) stomach Answer: (b) Question 25: Cramps are caused by heavy exercise resulting in the accumulation of ________. (a) carbon dioxide (b) lactic acid (c) ethanol (d) heat Answer: (b) Question 26: Which of the following are the stages of respiration in the correct order? (a) gaseous transport, breathing, tissue respiration and cellular respiration (b) breathing, gaseous transport, tissue respiration and cellular respiration (c) breathing, gaseous transport, cellular respiration and tissue respiration (d) breathing, tissue respiration, cellular respiration and gaseous transport Answer: (b) Question 27: Adrenaline increases _____________. (a) heart rate (b) blood pressure (c) amount of glucose in blood (d) all the above Answer: (d) Question 28: All the energy that passes along a food chain comes originally from: (a) oxygen (b) carbon dioxide (c) glucose (d) light Answer: (d) Question 29: Which of the followings is not a renewable source of energy? (a) hydroelectric power (b) tidal power (c) coal (d) wave power Answer: (c) Question 30: Which gas is responsible for the depletion of the ozone layer? (a) SO2 (b) CFC (c) CO (d) NH3 Answer: (b)

Question 31: In which stage of the cell division the chromosomes move from centre to pole of the spindle?

(a) Metaphase (b) Anaphase (c) Telophase (d) Pro-metaphase

Answer: (b) Question 32: How many pairs of autosomes are present in human body?

(a) 23 pairs (b) 22 pairs (c) One pair (d) 24 pairs

Answer: (b) Question 33: Which of the followings is made of protein and nucleic acid only?

(a) Bacterium (b) Fern (c) Virus (d) Algae

Answer: (c) Question 34: Where does electron transport chain take place?

(a) Golgi apparatus (b) Cytoplasm (c) Mitochondria (d) Chloroplast

Answer: (c) Question 35: Which of the followings is not a phytohormone?

(a) Abscisic acid (b) Ethanol (c) Dormin (d) Auxin

Answer: (b) Question 36: Which of the followings is a disaccharide?

(a) Cellulose (b) Galactose

(c) Maltose (d) Fructose

Answer: (c) Question 37: Which of the followings is storage-food in animal cell?

(a) Glucose (b) Starch (c) Glycogen (d) Cellulose

Answer: (c) Question 38: The finger like projections found in small intestine is called-

(a) Villi (b) Rugae (c) Alveoli (d) Ligament

Answer: (a) Question 39: Insulin is synthesized in__________________.

(a) Liver (b) Pancreas (c) Small intestine (d) Stomach

Answer: (b) Question 40: Which of the followings is a water-soluble vitamin?

(a) Vitamin-A (b) Vitamin-E (c) Vitamin-D (d) Vitamin-C

Answer: (d) Question 41: Which of the followings is the major energy fuel for the brain?

(a) acetate (b) lactate (c) glucose (d) glycine

Answer: (c)

Question 42: Human genome contains ___________base pairs.

(a) 2.2 billion (b) 3.2 billion (c) 4.2 billion (d) 5.2 billion

Answer: (b) Question 43: Which of the following statements is false?

(a) Mutation may delete a portion of DNA (b) Mutation may cause change in base pairs of DNA (c) A mutated gene may produce functional protein (d) Mutation can never be a reversible process

Answer: (d) Question 44: Matured red blood cells (RBC) do not contain-

(a) Golgi apparatus (b) Glycophorin C (c) Nucleus (d) Hemoglobin

Answer: (c) Question 45: Which virus is responsible for tumor?

(a) T2 phage (b) Dengue virus (c) Influenza virus (d) Papilloma

Answer: (d) Question 46: The most dangerous ultraviolet ray is-

(a) UV-B (b) UV-C (c) UV-A (d) UV-D

Answer: (b) Question 47: Fill in the blanks by selecting appropriate term(s) from the followings:

(A) Night blindness (B) Scurvy (C) Rickets (D) Beriberi (E) Calcium

(F) Vitamin-K (G) Iron (H) Hemoglobin (I) Myoglobin (J) Sucrose (K) Starch (L) Osteoporosis

(i) ___________ is present in muscle and can store oxygen. Answer: (I)

(ii) ______________ is found in sugar cane. Answer: (J)

(iii) Deficiency of vitamin-A causes _____________. Answer: (A)

(iv) ____________ helps in clotting blood. Answer: (E)

(v) Oxygen is carried to different parts of the body via ____________. Answer: (H)